Temple d'Apol·lo Sosià, època d'August, Roma

Temple of Apollo Sosianus, Rome. The three columns of the temple which survive to full-height
today belong to the Augustan rebuild, but the cult of Apollo had
existed in this area since at least to the mid 5th century BC when an
Apollinar (a sacred grove or altar) was recorded on this site. Since
Apollo was a foreign cult, it thus legally had to be placed outside
the pomerium. The first temple building dates to 431 BC, when the
consul Gnaeus Iulius Mento inaugurated one dedicated to Apollo Medicus
(the doctor), in fulfilment of a vow to him during a plague of 2 years
earlier